Hello all, I'm a relatively new engineer still wet behind the ears with this EMI and noise stuff. I'm trying to figure out where is and is not an appropriate place to put power choke coils, power filtering, and EMI beads. I have a board I'm putting an FPGA on with some other stuff which generates a moderate amount of digital noise, along with my regulators to get my 12V input down to 5/3.3/1.5V. Should I be putting a choke coil on the power supply + input only or the ground (-) input also? Should I tie my signal ground to chassis ground with my mounting hardware? Are EMI supression beads appropriate for both power and ground inputs from the supply? I apologize if these are really basic or "dumb" questions but I can't seem to figure this out. Thanks, Alex ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu